Lennox International Inc. ML193UH User Manual
E 2010 Lennox Industries Inc.
Dallas, Texas, USA
506465−01
07/2010
ML193UH
SERIES
GAS FURNACE
FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result in serious injury, death,
or property damage.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
Litho U.S.A.
WARNING
WHAT TO DO IF YOU SMELL GAS:
D Do not try to light any appliance.
D Do not touch any electrical switch; do not
use any phone in your building.
D Leave the building immediately.
D Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
D If you cannot reach your gas supplier, call
the fire department.
07/10
*2P0710*
506465−01
*P506465-01*
ML193UH Parts Identification
FLUE
COLLAR
UPPER ACCESS
PANEL
COMBUSTION AIR
INDUCER
TOP CAP
DURALOK
EXCHANGER
ASSEMBLY
AIR INTAKE COLLAR
BURNERS
GAS VALVE AND
PRESSURE SWITCH
ASSEMBLY
TM
HEAT
MANIFOLD
INTEGRATED
CONTROL
BLOWER ACCESS
PANEL
FIGURE 1
NOTE − This manual is the property of the homeowner
and must be left with the equipment user.
Notice to Homeowner
This furnace is equipped with safety devices that protect
you and your property. If one or more of these devices is
activated, furnace operation will stop. If your home is left
unattended for an extended period of time, equipment operation must be checked periodically. If this is not possible,
BLOWER
MOTOR
the water supply to the house should be shut off and the
pipes should be drained. This will prevent problems associ-
ated with a NO HEAT condition (frozen pipes, etc.)
CAUTION
Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at the
disconnect switch.
Page 2
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool. Breathing this may cause lung
cancer. (Fiberglass wool is known to the State of California to cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact your
supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
WARNING
Do not set thermostat below 60°F (16°C) in heating
mode. Setting thermostat below 60°F (16°C) reduces
the number of heating cycles. Damage to the unit
may occur that is not covered by the warranty.
WARNING
If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the furnace before
shutting off electrical supply.
WARNING
Do not use this furnace if any part has been underwater. A flood−damaged furnace is extremely dangerous. Attempts to use the furnace can result in
fire or explosion. Immediately call a licensed professional service technician (or equivalent) to inspect the furnace and to replace all gas controls,
control system parts, and electrical parts that have
been wet or to replace the furnace, if deemed necessary.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal injury or loss of life. Installation and service must
be performed by a licensed professional installer (or
equivalent), a service agency, or the gas supplier.
Safety Instructions
1 − Keep the furnace area clear and free of combustible
material, gasoline, and other flammable vapors and
liquids. If it is installed in an insulated area, the furnace
must be kept free of insulating material. Insulating material may be combustible.
2 − After any heavy snow, ice or frozen fog event, the fur-
nace vent pipes may become restricted. Always check
the vent system and remove any snow or ice that may
be obstructing the plastic intake or exhaust pipes.
3 − DO NOT obstruct air flow to unit. Unit must receive an
unobstructed flow of combustion and ventilating air.
DO NOT block or obstruct air openings on the furnace
or air openings to the area in which the furnace is
installed. Take care to maintain established clearances surrounding the furnace.
4 − DO NOT store chlorine or fluorine products near unit
or introduce these products into the combustion air.
These products can cause furnace corrosion.
5 − DO NOT draw return air from a room where this fur-
nace, or any other gas appliance (ie., a water heater), is installed. When return air is drawn from a room,
a negative pressure is created in the room. If a gas appliance is operating in a room with negative pressure,
the flue products can be pulled back down the vent
pipe and into the room. This reverse flow of the flue
gas may result in incomplete combustion and the
formation of carbon monoxide gas. This toxic gas
might then be distributed throughout the house by the
furnace duct system.
NOTICE
Any additions, changes, or conversions required in
order for the appliance to satisfactorily meet the application needs must be made by a licensed professional installer (or equivalent) using factory−specified and approved parts.
Page 3
WARNING
The blower door must be securely in place when the
blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into
the living space resulting in personal injury or death.
Loading...